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10 cards from this deck
Above 20,000 Hz
Sound waves with frequency above 20,000 Hz
Electrical oscillations converted to mechanical vibrations
Part reflected at boundary, rest transmitted
Reflected waves from boundaries show location
Time for echoes to return to detector
Prenatal scanning of foetus
Computer processes timing & distribution of echoes
Finding flaws in materials like metal or wood
Flaws cause earlier reflection than far side
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